Ethernet based Broadband Access Networks
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1 Ethernet based Broadband Access Networks Abhay Karandikar Department of Electrical Engineering IIT Bombay Mumbai ICBN 2003, Bangalore, Invited Talk
2 Agenda of Talk Current Broadband Access Architecture Ethernet in Next Generation Access Ethernet in First Mile Ethernet in Metro Access Transport Mechanism Ethernet in Metro Access Role of MPLS Ethernet in First Mile Eiso Architecture
3 Current Broadband Access Architecture First Mile xdsl DOCSIS Cable Network Broadband Wireless Metro Access Physical Layer SONET/SDH Transport ATM
4 DSL Access Architecture PSTN I nt erne t User CPE ATM swi t ch ADM BAS ADSL User CPE DSLAM ADM SDH Ri ng ADM User CPE ADM
5 Limitations of Current Access Architecture Low bandwidth High cost per port Inflexible provisioning For converged data, cell based/tdm based technology is inefficient
6 Requirements of Next Gen Broadband Access Architecture Scalable aggregation High bandwidth Efficient transport of voice, data and video Quality of Service (QoS) guarantees and usage based billing Rapid deployment and provisioning Protection and restoration capability
7 Next Gen Broadband Access First Mile Ethernet in the First Mile (EFM) Metro Access Next Generation SONET/SDH Ethernet over SONET/SDH Gigabit Ethernet 1/10 Gbps Fully meshed architecture Resilient Packet Ring/Dynamic Packet Transport
8 Standardization Ethernet in First Mile IEEE 802.3ah Ethernet in Metro Access Metro Ethernet Forum (MEF) MPLS Forum IETF MPLS Working Group IETF PWE3 Working Group
9 Ethernet in First Mile Efficient transport of broadband data Rapid provisioning Ethernet based solution can scale in granularity of 64 Kbps Optimized solution for multi-tenant/multi-unit residential/office building With Ethernet in Metro and Ethernet in Enterprise, EFM provides end to end Ethernet solution
10 EFM (IEEE 802.3ah) Approaches EFM Copper (EFMC) 10 Mbps over Copper up to at least 750 meters EFM Fiber (EFMF) 100 Mbps and 1 Gbps up to at least 10 Kms EFM PON 1 Gbps and beyond upto 20 Kms.
11 Ethernet in Metro Access Reduces the cost of per user provisioning Efficient and Flexible transport Ease of Interworking Ubiquitous adoption
12 Metro Ethernet Forum (MEF) Services Ethernet Line Service Point to Point Service Ethernet LAN Service Multipoint to multipoint (Source: Metro Ethernet Forum white paper)
13 Carrier Class Ethernet- Requirements Notion of Ethernet Virtual Circuit Connects two or more UNI Like ATM Virtual Circuit Guaranteed SLA and QoS Attributes Committed Information Rate (CIR) Committed Burst Size (CBS) Peak Information Rate (PIR) Maximum Burst Size (MBS)
14 Carrier Class Ethernet 50ms Resiliency and Protection Support of TDM voice through Circuit Emulation Provisioning and Service Management
15 Transport for Ethernet Services Native Ethernet IEEE 802.3, 802.3ad, 802.1p, 802.1Q, 802.1s, 802.1x MPLS RSVP-TE DiffServ for QoS
16 Ethernet as Transport - Limitations Carrier class features No admission control No buffer management/scheduling No concept of Ethernet circuit with QoS features and end to end context Inefficient multi-service transport Scalability Limited VLAN Tag space Large number of MAC addresses
17 Ethernet Limitations Protection and Restoration Limited protection and restoration Available only through Rapid Spanning Tree protocol Performance Management No OAM capability in Ethernet
18 MPLS as Transport Mechanism Scalability in terms of aggregation End to End QoS Guaranteed Bandwidth LSP Offers circuit setup and traffic engineering capabilities Protection and Restoration MPLS-TE (Backup LSP/LSP Preemption, Fast Reroute Option)
19 MPLS Bridges the gap Ethernet Encapsulation over MPLS Bridging the gap for providing Ethernet Line and Ethernet LAN services Martini Draft Layer 2 Ethernet VPN (point to point) Kompella Draft Layer 2 Ethernet VPN (point to multipoint)
20 Challenges.. Effective multi-service transport Circuit Emulation TDM circuit emulation over Packet Switched Network (CSEoPSN) (Sasha Draft) MPLS performance monitoring and service provisioning
21 Ethernet in First Mile--Issues IEEE 802.3ah working on MAC and PHY layer and OAM issues Issues not attempted Bandwidth Reservations and QoS in EFM Broadband Loop Emulation for multiservice transport
22 Eiso Access for EFM Eisodus Networks, a company incubated in IIT Bombay developing architecture for QoS management in EFM EFM Topology Hub and Spoke Tree and Branch (Eiso Access is patent pending concept of Eisodus Networks)
23 Ethernet Access Architecture PSTN Voice User User Et hernet Access Node Ethernet over DSL Ethernet Access Concentrator Data I nt erne t User
24 Eiso Access Architecture Ethernet transport in First Mile is on Ethernet Circuit Ethernet Circuit has QoS attributes Ethernet Switches in First Mile support QoS at Layer 2 (Priority Scheduling and Packet Dropping) Ethernet circuits can be aggregated into MPLS LSP at Ethernet Access Concentrator (which acts as LER)
25 Eiso QoS Management Ethernet Circuit Statically provisioned through NMS Dynamic provisioning through proprietary protocol TDM Voice over Ethernet Circuit Broadband Loop Emulation Service Level Specification CIR CBS Enforced through Ingress Rate Limiting
26 Conclusions Ethernet evolving as Next Generation Access Technology Cost Effective Flexible Simple MPLS with TE capabilities is key to provision Ethernet Services in Metro Access Proposed Eiso Architectures provides the bridge between Metro and Customer in First Mile
27 Acknowledgements Eisodus Networks Pvt Ltd Sunil Mehta Abhijit Gadgil Zainul Charbiwala Praveen Kumar
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